Love the Eva, but I vote for the Milla. I was going to get the Eva, but I don't think I'd use it that often. I got the milla and I use it in my purse to keep things organized and it's roomy enough to put a blackberry, lipgloss, money, Amex. Pretty roomy.
I had this same issue a month ago, and I ended up with a mini pochette! But in your case I'd go for the Milla, I think it's absolutely adorable. The eva is pretty and versatile, but it's probably too big to use as a pouch or clutch.
Eva a hundred times over! The Eva is extremely versatile. Carry as a clutch, use the chain on the shoulder, or use the long strap and wear across the body. It can be used formally (I used it at my sis' wedding) or informally. It's the best bag! Soooo classy!!! Big enough for all the essentials but small enough for going out and comfortably fitting on your shoulder.